我国东南部花岗岩古地貌与现代侵蚀关系的研究——以湖南衡山为例

 研究中国东南部花岗岩侵蚀地貌与水土流失的关系,以期为本区农业和环境持续发展提供参考。通过分析衡山花岗岩古地貌坡形、坡向和物质构成对现代侵蚀的影响,发现:古代侵蚀地貌是现代侵蚀产生和发展的基础;在人类干扰较少时,现代侵蚀应为正常侵蚀,而在植被受到破坏时,就有可能产生加速侵蚀。同时,现代侵蚀又是对地貌的重新塑造过程,现代侵蚀与石蛋地貌、沟壑崩岗地貌、坡谷地貌的形成与发育,存在密切关系。单一的人工植被,在一定程度上减缓土壤侵蚀,稳定地貌发育,但与自然形成的草、灌、乔混交林相比,相差甚远。

Relationship of Ancient-landform and Modern Erosion of Granite Areas in Southeast of China--Take Hengshan mountain in Hunan as an Example

The relationship between the soil erosion and water loss and the eroded landform of granite in southeast of China is studied, and that maybe offer reference of sustainable development in agriculture and environment in the area. The analysis of influence of slope shape, direction and formation of its matter on the modern erosion in granite ancient landform in Hengshan mountain showed that the ancient landform is the basic factor of the production and development of modern erosion. When little disturbance of human activities was, modern erosion must be natural erosion. But if the vegetation is destroyed, then the accelerating erosion may take place. Meanwhile the modern erosion reshape the landform, affecting the formation and development of rock, gully slope collapse and slope vale landform. Single planted vegetation decreases the soil erosion at certain extent and stabilizes the development of landform, but far off the mixed vegetation of nature formation.